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result in burying both CR20A and Corkscrew Gulch under several thousand percent more material than <br /> will be generated from the proposed operation. <br /> 10925 1 10925 <br /> 10900 \,........ 1—1 10900 <br /> - - <br /> 10875 ---- i - - -- - 1 - - - - - , - - I - - 10875 <br /> X ` <br /> \ 1 <br /> 10850 j , ,,, i 10850 <br /> ..%.,., <br /> PERM'T BGUNOARY <br /> 10825 - - - , - - - I .`\APPRGX FILL 29 i- t - - - I - - -� --' 10825 <br /> h` <br /> 10800 — -� -- 'N \ \so 10800 <br /> \ <br /> 10775 N N. I j - 10775 <br /> N. APPROX c_ EXISTING ACCESS ROAD <br /> \ APPROA FILL 22' <br /> 10750 I I \ -�--�� I 10750 <br /> N. ....Sr —APPROX CL O R- 20A <br /> ', APPROX FILL `E' <br /> N �f <br /> ' - <br /> 10725 - I 10725 <br /> 10700 10700 <br /> —50-25 0 25 50 75 100 125'50"75 200 225 250 275 300 325 350 375 400 425 450 475 500 525 550 575 600 625 <br /> Blasting and Vibrations <br /> Attachment Z2. Matheson Mining Consultants Blasting and Vibration Analysis details a vibration <br /> analysis of the proposed blasting plan described in Exhibit C. Based on the maximum charge weight of <br /> 66.14 pounds per 8ms delay, the nearest building could be safely located 447.3 feet from the Von Doose <br /> portal without requiring seismic monitoring. There are no buildings or other structures within several <br /> thousand feet of the portal or affected area. <br /> The portal located on the Nella M is approximately 826 feet from the Von Doose portal. Using the peak- <br /> particle-velocity equation cited by Matheson, at that distance an allowable charge weight of 221 pounds <br /> per 8ms delay could be safely used without requiring seismic monitoring. That is 334% larger than the <br /> maximum charge weight for the Von Doose. AMR can confidently state that no damage will occur to the <br /> Nella M portal from blasting activities at the Von Doose. <br /> Page 2 of 2 <br />